Roman Empire's greatest war on the Balkans happened with the rising Dacian Kingdom, who at their time were the strongest kingdom in Balkans, abundant iron and metal-working culture among Dacians made swords available not only to aristocrats but commoners as well which made the Dacians on their time the most militarily equipped people.
Initially the Dacians were paid tribute by Rome to remain neutral on conflicts and maintain peace, but eventually that would not last for too long.
A documentary on this:
https://www.youtube.com/watch?v=pX8xD9N5l90
Initially the Dacians were paid tribute by Rome to remain neutral on conflicts and maintain peace, but eventually that would not last for too long.
A documentary on this:
https://www.youtube.com/watch?v=pX8xD9N5l90